UNLESS (TRỪ KHI) = IF . NOT (NẾU KHÔNG) CÔNG DỤNG CÔNG THỨC CỦA UNLESS CÔNG THỨC CỦA MỆNH ĐỀ IF (PHỤ) - unless = if . not - unless chỉ dùng để thay thế mệnh đề phụ trong câu điều kiện, mệnh đề chính không đổi. 1. Unless S + V1/s(es) ↔ If S + don’t / doesn’t + Vo 2. Unless S + am, is, are ↔ If S + am, is, are + not 3. Unless S + V2/ ed ↔ If S + didn’t + Vo 4. Unless S + were ↔ If S + weren’t 5. Unless S + had V3/ed ↔ If S + hadn’t V3/ed 6. Unless S + had been ↔ If S + hadn’t been Examples : 1. Unless you stay at your bed, you will be punished.  If you don’t stay at your bed, you will be punished. 2. Unless she drinks water, she will feel thirsty.  If she doesn’t drink beer, she will feel thirsty. 3. Unless they were absent now, they would meet the head master.  If they weren’t absent now, they would meet the head master. 4. Unless he cleaned up the car now, his boss could ask him to do this.  If he didn’t clean up the car now, his boss could ask him to do this. 5. Unless you had stayed at home yesterday, you wouldn’t have enjoyed a delicious meal.  If you hadn’t stayed at home yesterday, you wouldn’t have enjoyed a delicious meal. 6. Unless he had been busy last night, he could have met his friends.  If he hadn’t been busy last night, he could have met his friends. Rewrite the statements by using the conditional sentences: 1. You can’t run fast unless you try your best. . 2. Because Tom is out, you don’t see him at home. . 3. The boy wouldn’t go swimming unless the weather were nice. . 4. Everything was tidy, so I felt pleasant. . 5. We could have slept well unless the noise had been turned off. . 6. People hear you coming to my office. They phone me. . 7. Unless you lived in the dormitory, you could annoy me. . 8. Ngoc didn’t save my kids from hot water because Ngoc was busy meeting his customers. . 9. Unless the student goes to school early, he will be punished. . 10. Minh doesn’t get rid of his job because he loves working with computers. . 11. Unless last night your sister had gone home early, your mother could have waited for her. . 12. Because my mother wasn’t here, I didn’t ask for some money. . 13. The dogs can’t bite you unless you touch them. . 14. The books are expensive. I can’t buy them. . 15. I couldn’t think of myself unless I had some troubles. . 16. Harry Porter is an adventure film because it talks about the life and the discoveries of him. . 17. Her car wouldn’t have been broken yesterday unless she had driven fast. . 18. Hoa wrote to her parents. She wanted to greet them. . 19. Unless people knew you, they wouldn’t give you some precious information. . 20. Because these projects were out of date, the manager looked uncomfortable. . 21. Unless the young girl stops smoking, she won’t be healthy. . 22. I don’t like cats because cats are fury. . 23. Unless ten years ago they had lived in USA, they couldn’t have been the citizens in this country. . 24. Tom didn’t join the camping. I couldn’t persuade him to go with us. . 25. People can’t swim unless they study how to swim. . 26. Anne doesn’t attend the party because she wants to be alone. . 27. This department couldn’t be destroyed unless it built carefully. . 28. Susan agreed to go swimming because she liked water. . 29. Yesterday, I could have been injured unless I had seen a big container in the street. . 30. Sports make people healthy, so they do exercise every morning. . 31. Unless you were me, you couldn’t understand me. . 32. We are the world. We can co - operate one another. . 33. Unless this man is a driver, he can’t help you move by car. . 34. Dannis isn’t at home because he is on business. . 35. Unless they had been on the phone last night, they couldn’t have known the big secrets. . 36. Because man is the first person on Earth, he discovers the earth by hands and brain. . 37. You can’t join the club unless you are sick. . 38. Our picnic was passed easily because my mother helped me. . 39. Unless he refused everything, he would lose his family. . 40. Anne carried out a plan. Her family admired her so much. . 41. Unless I saved my money, someone would take it. . 42. Because she wasn’t tired, she could go on running. . 43. Linda can’t do her homework unless she is free. . 44. Richard played piano well, so everyone clapped their hands. . . UNLESS (TRỪ KHI) = IF . NOT (NẾU KHÔNG) CÔNG DỤNG CÔNG THỨC CỦA UNLESS CÔNG THỨC CỦA MỆNH ĐỀ IF (PHỤ) - unless = if . not - unless chỉ. 1. Unless S + V1/s(es) ↔ If S + don’t / doesn’t + Vo 2. Unless S + am, is, are ↔ If S + am, is, are + not 3. Unless S + V2/ ed ↔ If S + didn’t + Vo 4. Unless